8: 6 Wireless Networking Flashcards
Wi-Fi (802.11 standard)
Wireless standards on how wireless devices communicate with each other and access points.
How Wi-Fi works
Replaces network cables with radio transmitters and receivers- often connected to local networks that are connected to internet.
WAP
Wireless Access Points that connect wireless networks to wired networks and the internet
Different 802.11 standards
- 11 (1997) allows 2 Mbps
- 11b (1999) allows 11 Mbps
- 11g (2003) allows 22 Mbps
- 11n (2009) allows 600 Mbps
Wi-Fi security concern
Subject to undetectable interception.
WEP
Wired Equivalent Privacy - original encryption standard that is no longer considered secure
WPA
Wi-Fi protected access, replaced WEP in 2003 that used TKIP to add encryption keys, but now contains vulnerabilities.
WPA2
Version 2 that uses AES encryption standard that using the CCM protocol, widely used and considered secure.
WPA3
Version 3 that is now required on Wi-Fi devices from 2020 onward. Supports CCMP and uses SAE for key exchange.
3 mechanisms to authenticate a user of a wireless network
Pre-Shared keys, enterprise authentication, captive portals
Pre-Shared Keys
Simplest form of authentication, using an encryption key. Either a hexadecimal string or a password (password converted to a key)
Enterprise Authentication
Authorization server validates the credentials of the users. Uses version of EAP, like PEAP which uses TLS.
Secure versions of EAP
EAP TLS, EAP TTLS, EAP-Fast
Insecure versions of EAP
EAP MD5, LEAP
Captive Portals
Redirected to a webpage that can grant authentication (payment, accept terms of services)
